Does not work if the "problem" is already there

We bought 2 of these things now. The were more preventative procured because the neighbor had hills and we wanted to avoid this with us. This has worked well in the first year. We did not have a single hill. The question is whether the product was responsible, or the mole had simply found a way to us.

Just before winter We recovered these things, so they do not freeze broken. Since the mole 5 shitload had an easy time .... made overnight on the grass. After we had driven away 2 wheelbarrows earth vibrators were immediately reactivated. The halls were however already there and now we have every day new hill, every day closer to the vibrator.

My guess is it was a female and it is on the vibrator ... at least we are now falling, before the little one's feet breaking because the whole lawn is undermined in the summer.